ST L4941 User Manual

L4941

Very low drop 1A regulator

Feature summary

■Low dropout voltage (450mV typ. at 1A)

■Very low quiescent current

■Thermal shutdown

■Short circuit protection

■Reverse polarity protection

Description

The L4941 is a three terminal 5V positive regulators available in TO-220 and DPAK packages, making it useful in a wide range of industrial and consumer applications. Thanks to its very low input/output voltage drop, these devices are particularly suitable for battery powered equipments, reducing consumption and

TO-220

DPAK

prolonging battery life. It employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection.

Order code

	Part number		Package
	L4941BV		TO-220
	L4941BDT-TR		DPAK
September 2006	Rev. 5		1/17
			www.st.com

		L4941
	Contents
1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 5
4	Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 6
5	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 7
6	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . 8
7	Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 11
8	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 12
9	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 16

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L4941	Block diagram

1 Block diagram

Figure 1. Block diagram

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Pin configuration	L4941

2 Pin configuration

Figure 2. Pin connections (top view)

			TO-220				DPAK

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L4941							Maximum ratings
3	Maximum ratings
Table 1.	Absolute maximum ratings
Symbol			Parameter				Value		Unit
VI			Forward input voltage			30			V
VIR			Reverse input voltage (RO=100Ω)			-15			V
IO			Output current			Internally Limited			mA
PD			Power dissipation			Internally Limited			mW
Tstg			Storage temperature range				-40 to +150		°C
Top			Operating junction temperature range				-40 to +150		°C
Note:	Absolute Maximum Ratings are those values beyond which damage to the device may
	occur. Functional operation under these condition is not implied
Table 2.	Thermal Data
Symbol			Parameter	TO-220			DPAK		Unit
RthJC		Thermal resistance junction-case		3			8		°C/W
RthJA		Thermal resistance junction-ambient		50			100		°C/W

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Test circuits	L4941

4 Test circuits

Figure 3. DC Parameters

Figure 4. Load rejection

Figure 5. Ripple rejection

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